二次谐波显微术精确测定ZnS单根纳米线的晶向
Precise Determination of the Crystallographic Orientations in Single ZnS Nanowires by Second-Harmonic Generation Microscopy
摘要：
本文对单根硫化锌纳米线的二次谐波产生进行了系统的研究。采用化学气相沉积法制备了高质量的圆形截面ZnS纳米线。透射电子显微镜图像显示实际生长轴与择优生长方向有0 o ~ 20 o的偏离角[120]，这导致了不同单个ZnS纳米线中不同的偏振相关SHG响应图案。二次谐波响应对ZnS纳米线的c轴取向以及（100）和（010）晶轴取向都很敏感，因此可以精确地确定ZnS纳米线的三个晶轴取向。单根ZnS纳米线的倍频转换效率高达7 × 10^（-6），在纳米紫外光源、非线性光学显微镜和纳米光子器件等方面具有潜在的应用前景。
英文摘要：
We report on the systematical study of the second-harmonic generation (SHG) in single zinc sulfide nanowires (ZnS NWs). The high quality ZnS NWs with round cross-section were fabricated by chemical vapor deposition method. The transmission electron microscopy images show that the actual growth-axis has a deviation angle of 0o~20o with the preferential growth direction [120], which leads to the various polarization-dependent SHG response patterns in different individual ZnS NWs. The SHG response is quite sensitive to the orientations of c-axis as well as the (100) and (010) crystal-axis of ZnS NWs, thus all the three crystal-axis orientations of ZnS NWs are precisely determined by the SHG method. A high SHG conversion efficiency of 7*10^(-6) is obtained in single ZnS NWs, which shows potential applications in nanoscale ultraviolet light source, nonlinear optical microscopy and nanophotonic devices.
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